The Charged Coupled Devices (CCDs) are digital photo-detectors extensively used in optical-infrared observational astronomy, primarily working on the principle of the photoelectric effect. Based on the proposed scientific goals, the manufacturers could provide a range of various parameters of CCDs (gain, readout speed, readout noise, etc.) to make the best use of the dynamic range [1]}. It is always recommended to verify various CCD parameters observationally to increase observations' accuracy and control possible degradation of the CCD electronics with time. The present work discusses the characterization results of the STA-4150A 4K\(\times \) 4K CCD Imager mounted at the axial port of the 3.6m Devasthal Optical Telescope (DOT; [2]}, [3]}, [4]}, [5]}) based on the data accumulated between early 2016 to early 2021. In this work, verification of CCD parameters like gain and readout noise (RN) are performed for all given combinations of readout speeds along with the verification of the bias stability. Preliminary characterization results for the 4K\(\times \) 4K CCD Imager based on the data collected during 2016-2017 are presented in [4]} (hereafter blueP18).
